• Khanna Hydraulics

Variable Displacement Vane Pump

Khanna Hydraulics offers Variable Displacement Vane Pump, RV20 Series. These are variable displacement single vane pumps. They come with in-built pressure compensator and flow cut off, which in turn give good power saving. RV20 series pump is widely used for machine tools, etc. RV-20 series are direct operated variable displacement pumps. These mainly consist of body, cover, vanes, cam ring, spring, pressure adjustment screw and port plate and rotor shaft. Suction and pumping process: The vanes, rotor, cam ring, port plate and the cover form the chambers, which are necessary to transport the fluid. As the rotor rotates the chambers increase in size and due to the pressure difference fluid is sucked in the suction port. As the rotor continues to rotate the fluid is pushed into a region with a smaller volume as a result giving pressurised fluid, which is then delivered, through the pressure port. Pressure and flow control: by means of the spring, the cam ring will be held in an eccentric position at the start-up position. The maximum operating pressure required in the system is set using the pressure adjustment screw via spring. The cam ring will be pushed against the force of the spring due to pressure produced by the operation of the pump. The cam ring is pushed to zero position from its eccentric position, if the pressure produced by the pump equals the spring force. The flow can be adjusted using the flow adjustment screw. If the maximum pressure set at the spring has been reached, the pump virtually reduces the flow to zero. Hence operating pressure is maintained and only the leakage fluid is replaced. Therefore losses and heating of the fluid is kept to the minimal. RV20 variable vane pump is equivalent to PV7 of Rexroth and technically equivalent to the company’s SVPF-12-70-20 pump.